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Effects of Nitrogen in Sewage Treatment Plant Effluent on Organic Matter Target Indicator of TMDLs in Korea

Department of Urban Planning and Real Estate, Cheongju University, 298 Daeseongro, Cheongwon-gu, Cheongju-si 28503, Korea
Academic Editor: Antonio Panico
Water 2022, 14(11), 1702; https://doi.org/10.3390/w14111702
Received: 26 April 2022 / Revised: 17 May 2022 / Accepted: 24 May 2022 / Published: 25 May 2022
(This article belongs to the Section Water Quality and Contamination)
This study examined the relationship between water quality indicators (five-day biochemical oxygen demand (BOD5) and ammonia nitrogen (NH3-N)) by modeling them at sewage treatment plants (STPs) and receiving waters. Discharge loads from 2016 to 2018 were input into the QUAL-MEV water quality model, which is used for the total maximum daily loads (TMDLs) in Korea, and the results showed that the simulated BOD5 values decreased according to the reduction in the BOD discharged pollution load, while the observed water quality increased. This was caused by an increase in the total nitrogen discharged pollution load and the NH3-N effluence ratio from the STPs. Hence, the model was modified to reflect real-world conditions. After inputting a calibration factor calculated based on real data and the measured ratio of each type of nitrogen, the simulation was repeated, achieving results within ±20% of observed values. This model confirmed that BOD5 in the lower part of the river varies according to the change in the NH3-N ratio of the STP effluent. To better manage BOD5 and to establish achievable water quality targets, a plan that reflects the linkage among water quality indicators, such as the TMDLs used in the United States, should be introduced in Korea. View Full-Text
Keywords: total maximum daily load; ammonia nitrogen; five-day biochemical oxygen demand; sewage treatment plant; wastewater treatment plant total maximum daily load; ammonia nitrogen; five-day biochemical oxygen demand; sewage treatment plant; wastewater treatment plant
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MDPI and ACS Style

Lee, E.J. Effects of Nitrogen in Sewage Treatment Plant Effluent on Organic Matter Target Indicator of TMDLs in Korea. Water 2022, 14, 1702. https://doi.org/10.3390/w14111702

AMA Style

Lee EJ. Effects of Nitrogen in Sewage Treatment Plant Effluent on Organic Matter Target Indicator of TMDLs in Korea. Water. 2022; 14(11):1702. https://doi.org/10.3390/w14111702

Chicago/Turabian Style

Lee, Eun Jeong. 2022. "Effects of Nitrogen in Sewage Treatment Plant Effluent on Organic Matter Target Indicator of TMDLs in Korea" Water 14, no. 11: 1702. https://doi.org/10.3390/w14111702

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